Greylisting

Installation

apt-get install postgrey

in /etd/default/postgrey (Achtung: hier laeuft postfix in einer chroot Umgebung)

POSTGREY_OPTS="--unix=/var/spool/postfix/var/run/postgrey --delay=60"

in postfix integrieren

/etc/postfix/main.cf

smtpd_recipient_restrictions=...
                             check_policy_service unix:/var/run/postgrey,
                             ...

Postfix neu starten

service postfix restart

Test

Mail schicken und in Maillog kucken.